downfall vs last roundup

downfall

noun
  • A precipitous decline in fortune; death or rapid deterioration, as in status or wealth. 

  • The cause of such a fall; a critical blow or error. 

  • An act of falling down. 

verb
  • To fall down; deteriorate; decline. 

last roundup

noun
  • Death. 

  • A final gathering of people or items; the final event in a series of events involving a group or organization. 

How often have the words downfall and last roundup occurred in a corpus of books? (source: Google Ngram Viewer )